A western Pennsylvania man has died after lying on train tracks and being struck by a locomotive, but investigators still don't know why that happened.

The Westmoreland County coroner's office has identified the dead man as 21-year-old Tyler Quakenbush, who lived in Latrobe, not far from where he was hit by the Norfolk Southern freight train about 12:40 a.m. Tuesday. Latrobe is about 40 miles east of Pittsburgh.